<template>
  <view>
    <my-search @click='gotoSearch'></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滑动区域 -->
      <scroll-view scroll-y :style="{height:wh+'px' }" class="left-scroll-view">
        <!-- 一级分类 -->
        <block v-for="item,i in cateList" :key='i'>
          <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y :style="{height:wh+'px' }" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-level2" v-for="item2,i2 in cateLevel2" :key='i2'>
          <!-- 二级分类标题 -->
          <view class="cate-level2-title">
            / {{item2.cat_name}} /
          </view>
          <!-- 三级分类 -->
          <view class="cate-level3-list">
            <view class="cate-level3-item" v-for="item3,i3 in item2.children" :key='i3' @click="gotogoodlist(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        //一级分类商品数据
        cateList: [],
        active: 0,
        //二级分类商品数据
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        console.log(res)
        if (res.meta.status !== 200) return uni.$showMsg()
        //一级分类
        this.cateList = res.message
        //二级分类
        this.cateLevel2 = res.message[0].children
      },
      // 选中项改变的事件处理函数
      activeChanged(i) {
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        //滚动条重置
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //三级分类跳转到对应详情页面
      gotogoodlist(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
        })
      },
      //点击搜索跳转到搜索页面
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      },
      //设置tabbar购物车设置数字徽标
      setBadge(){
        uni.setTabBarBadge({
          index:2,
          text:this.total+''   //text只能是字符串
        })
      }
      
    }
  }
</script>

<style lang="scss" scoped>
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        background-color: #F7F7F7;
        line-height: 60px;
        text-align: center;
        font-size: 12px;

        &.active {
          background-color: #FFFFFF;
          position: relative;

          &::before {
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 50%;
            left: 1px;
            transform: translateY(-50%);
          }
        }
      }
    }

    .right-scroll-view {

      .cate-level2 {
        .cate-level2-title {
          font-size: 12px;
          font-weight: bold;
          text-align: center;
          padding: 15px 0;

        }

        .cate-level3-list {
          display: flex;
          flex-wrap: wrap;

          .cate-level3-item {
            display: flex;
            width: 33.33333%;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            margin-bottom: 10px;

            image {
              width: 60px;
              height: 60px;
            }

            text {
              font-size: 12px;
            }
          }
        }
      }
    }
  }
</style>
